| Index | Vandalia | Illinois | National |
| Average Test Scores | 27% | 33% | 48% |
| Student/Teacher ratio | 20:1 | 18:1 | 16:1 |
| Total public schools | 9 | 3,938 | 79,221 |
| Total private schools | 1 | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | Vandalia | Illinois | National |
| Completed 8th grade | 74.0% | 86.2% | 84.3% |
| Completed high school | 70.9% | 84.7% | 83.0% |
| Completed some college | 44.7% | 61.8% | 59.4% |
| Completed associate degree | 19.1% | 40.7% | 38.5% |
| Completed bachelors | 13.6% | 32.9% | 30.3% |
| Completed masters | 4.5% | 12.7% | 11.5% |
| Completed professional degree | 0.9% | 3.4% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of 9 public schools, 1 private schools and n/a post-secondary schools in Vandalia. Using the proficiency score averages, the average test scores for Vandalia, IL schools is 27%. The average student to teacher ratio is 20:1. In Vandalia, IL, an average of 74.0% of students have completed 8th grade and an average of 70.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Ramsey, IL | 871 | 36% | 25.5% |
| Greenville, IL | 6,725 | 36% | 26.0% |
| Brownstown, IL | 839 | 29% | 39.6% |
| St. Elmo, IL | 1,466 | 29% | 39.9% |
| Coffeen, IL | 640 | 25% | 47.9% |
| Vandalia, IL | 6,615 | 27% | 44.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Trinity, NC | 6,619 | 48% | 0.9% |
| Upper Sandusky, OH | 6,609 | 74% | 54.0% |
| Marianna, FL | 6,607 | 45% | 6.7% |
| Stickney, IL | 6,607 | 32% | 33.3% |
| Fox Point, WI | 6,623 | 64% | 32.3% |
| Vandalia, IL | 6,615 | 27% | 44.4% |
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